...the week-long talks...come amid complaints by environmental groups that some toxic substances - radioactive waste and cancer-causing chemicals - risk being dropped from the draft deal under pressure from industry lobbyists. Friends of the Earth and other activists warn that some countries are pressing for known carcinogenic substances - such as beryllium, a metal used in some electronic appliances, and chromium VI, employed in pigments and dyes, leather tanning, and wood preserving - to be removed from the list. Another area of concern is styrene - a possible carcinogen used widely in rubber, plastics, insulation, fiberglass, and autoparts - which is also in line to be omitted.